Update, 3:29 pm: A group in Solo, Java, with suspected links with the Islamic State group was behind Thursday's attack in Jakarta, Deputy police chief Budi Gunawan said.

He said the militant group supported Isis and was also in contact with the extremist group in Syria, BBC reported.

The group had planned to launch a "huge bomb concert" on New Year's Eve, "But because the Indonesian police had anticipated that threat by deploying tight security on New Year's Eve, the group launched this attack today", Gunawan said.

Update, 2:23 pm: The bomb and gun attacks ended in Central Jakarta where several people were reportedly killed on Thursday, the Indonesian police said.

The lockdown of the United Nations office near the site of explosions will be lifted soon, Jeremy Douglas -- the Regional Representative of the United Nations Office on Drugs and Crime -- said in a tweet.

Lockdown about to lift & staff to go in small groups. Off to security briefing with @collie_brown to get facts and cut through rumours

Update, 1:07 pm: All Starbucks stores in Jakarta have been closed until further notice after bomb blast was reported at one of its cafes at the centre of the Indonesian capital, the American coffeehouse chain announced.

"Initial reports are that an explosion took place close to our store in the Skyline building near one of these police posts... This store and all other Starbucks stores in Jakarta will remain closed, out of an abundance of caution, until further notice," Starbucks statement said.

"One customer sustained injuries and was treated on the scene; our partners (employees) are all confirmed to be safe," it added.

Update, 12:02 pm: The Indonesian intelligence reportedly dismissed the reports of suspected involvement of the Islamic State group.

"This is definitely terrorism, but there are no indications yet that it's Isis related," Reuters quoted Sutiyoso, the Director of the State Intelligence Agency, as saying.

At least three people were reportedly killed in several explosions near the United Nations office in Central Jakarta, Indonesia, on Thursday.

The Indonesian police suspect one of the attacks to have been carried out by a suicide bomber, Reuters reported.

While one of the explosions took place at a Starbucks cafe, another was reported in front of Sarinah Mall -- a shopping centre in Central Jakarta.

"The Starbucks cafe windows are blown out. I see three dead people on the road. There has been a lull in the shooting but someone is on the roof of the building and police are aiming their guns at him," a Reuters photographer said.

Gunfire is underway at the site of the blasts.

A UN official tweeted that six bombs had exploded in the area. "Apparent suicide bomber literally 100m from the office and my hotel," Jeremy Douglas, the Regional Representative of the United Nations Office on Drugs and Crime, tweeted.